Cosmic Evolution of Black Holes and Spheroids. IV. The BH Mass - Spheroid Luminosity Relation (2009)
Bennert, Vardha Nicola, Treu, Tommaso, Woo, Jong-Hak, Malkan, Matthew A., Bris, Alexandre Le, Auger, Matthew W., ...
From high-resolution images of 23 Seyfert-1 galaxies at z=0.36 and z=0.57 obtained with the Near Infrared Camera and Multi-Object Spectrometer on board the Hubble Space Telescope (HST), we determine...
Understanding the Geometry of Astrophysical Magnetic Fields (2009)
Broderick, Avery E., Blandford, Roger D.
Faraday rotation measurements have provided an invaluable technique with which to measure the properties of astrophysical magnetized plasmas. Unfortunately, typical observations provide information...
On the Energy Spectra of GeV/TeV Cosmic Ray Leptons (2009)
Stawarz, Lukasz, Petrosian, Vahe, Blandford, Roger D.
Recent observations of cosmic ray electrons from several instruments have revealed various degrees of deviation in the measured electron energy distribution from a simple power-law, in a form of an...
Morganson, Eric, Marshall, Phil, Treu, Tommaso, Schrabback, Tim, Blandford, Roger D.
We have searched 4.5 square degrees of archival HST/ACS images for cosmic strings, identifying close pairs of similar, faint galaxies and selecting groups whose alignment is consistent with...
McKinney, Jonathan C., Blandford, Roger D.
Rotating magnetized compact objects and their accretion discs can generate strong toroidal magnetic fields driving highly magnetized plasmas into relativistic jets. Of significant concern, however,...
What is the largest Einstein radius in the universe? (2008)
Oguri, Masamune, Blandford, Roger D.
The Einstein radius plays a central role in lens studies as it characterises the strength of gravitational lensing. The distribution of Einstein radii near the upper cutoff should probe the largest...
Automated detection of galaxy-scale gravitational lenses in high resolution imaging data (2008)
Marshall, Philip J., Hogg, David W., Moustakas, Leonidas A., Fassnacht, Christopher D., Bradac, Marusa, Schrabback, Tim, ...
Lens modeling is the key to successful and meaningful automated strong galaxy-scale gravitational lens detection. We have implemented a lens-modeling "robot" that treats every bright red galaxy (BRG)...
First-Year Spectroscopy for the SDSS-II Supernova Survey (2008)
Zheng, Chen, Romani, Roger W., Sako, Masao, Marriner, John, Bassett, Bruce, Becker, Andrew, ...
This paper presents spectroscopy of supernovae discovered in the first season of the Sloan Digital Sky Survey-II Supernova Survey. This program searches for and measures multi-band light curves of...
Hot self-similar relativistic MHD flows (2008)
Zakamska, Nadia L., Begelman, Mitchell C., Blandford, Roger D.
We consider axisymmetric relativistic jets with a toroidal magnetic field and an ultrarelativistic equation of state, with the goal of studying the lateral structure of jets whose pressure is matched...
The sloan digital sky survey-II supernova survey: technical summary (2008)
Frieman, Joshua A., Bassett, Bruce, Becker, Andrew, Choi, Changsu, Cinabro, David, DeJongh, Fritz, ...
First-year spectroscopy for the sloan digital sky survey - II. Supernova survey (2008)
Zheng, Chen, Romani, Roger W., Sako, Masao, Marriner, John, Bassett, Bruce, Becker, Andrew, ...
Amin, Mustafa A., Wagoner, Robert V., Blandford, Roger D.
The relationship between the metric and nonrelativistic matter distribution depends on the theory of gravity and additional fields, providing a possible way of distinguishing competing theories. With...
Cosmic Evolution of Black Holes and Spheroids. II: Scaling Relations at z=0.36 (2007)
Treu, Tommaso, Woo, Jong-Hak, Malkan, Matthew A., Blandford, Roger D.
We combine Hubble Space Telescope images of a sample of 20 Seyfert galaxies at z=0.36 with spectroscopic information from the Keck Telescope to determine the black hole mass - spheroid luminosity...
Magnetocentrifugal Winds in 3D: Nonaxisymmetric Steady State (2006)
Anderson, Jeffrey M., Li, Zhi-Yun, Krasnopolsky, Ruben, Blandford, Roger D.
Outflows can be loaded and accelerated to high speeds along rapidly rotating, open magnetic field lines by centrifugal forces. Whether such magnetocentrifugally driven winds are stable is a...
A kinematical approach to dark energy studies (2006)
Rapetti, David, Allen, Steven W., Amin, Mustafa A., Blandford, Roger D.
We present and employ a new kinematical approach to cosmological `dark energy' studies. We construct models in terms of the dimensionless second and third derivatives of the scale factor a(t) with...
Cosmic Evolution of Black Holes and Spheroids. I: The M_BH-sigma Relation at z=0.36 (2006)
Woo, Jong-Hak, Treu, Tommaso, Malkan, Matthew A., Blandford, Roger D.
We test the evolution of the correlation between black hole mass and bulge velocity dispersion (M$_{\rm BH}-\sigma$), using a carefully selected sample of 14 Seyfert 1 galaxies at $z=0.36\pm0.01$. We...
The Structure of Magnetocentrifugal Winds I. Steady Mass Loading (2004)
Anderson, Jeffrey M., Li, Zhi-Yun, Krasnopolsky, Ruben, Blandford, Roger D.
We present the results of a series of time-dependent numerical simulations of cold, magnetocentrifugally launched winds from accretion disks. Our simulations span four and half decades of mass...
Rathore, Yasser, Blandford, Roger D., Broderick, Avery E.
We consider the evolution of white dwarfs with compact object companions (specifically black holes with masses up to 10^6 solar masses, neutron stars, and other white dwarfs). We suppose that the...
Cool White Dwarfs Revisited -- New Spectroscopy and Photometry (2003)
Salim, Samir, Rich, R. Michael, Hansen, Brad M., Koopmans, L. V. E., Oppenheimer, Ben R., Blandford, Roger D.
In this paper we present new and improved data on 38 cool white dwarfs identified by Oppenheimer et al. 2001 (OHDHS) as candidate dark halo objects. Using the high-res spectra obtained with LRIS, we...
Magneto-Centrifugal Launching of Jets from Accretion Disks. II: Inner Disk-Driven Winds (2003)
Krasnopolsky, Ruben, Li, Zhi-Yun, Blandford, Roger D.
We follow numerically the time evolution of axisymmetric outflows driven magneto-centrifugally from the inner portion of accretion disks, from their launching surface to large, observable distances....
Two Dimensional Adiabatic Flows onto a Black Hole: I. Fluid Accretion (2003)
Blandford, Roger D., Begelman, Mitchell C.
When gas accretes onto a black hole, at a rate either much less than or much greater than the Eddington rate, it is likely to do so in an "adiabatic" or radiatively inefficient manner. Under fluid...
The Redshift of the Lensed Object in the Einstein Ring B0218+357 (2002)
Cohen, Judith G., Lawrence, Charles R., Blandford, Roger D.
We present a secure redshift of z=0.944\pm0.002 for the lensed object in the Einstein ring gravitational lens B0218+357 based on five broad emission lines, in good agreement with our preliminary...
Black hole mass and spin coevolution by mergers (2002)
Hughes, Scott A., Blandford, Roger D.
Massive black holes appear to be present in the nuclei of almost all galaxies, but their genesis and evolution are not well understood. As astrophysical black holes are completely characterized by...
Structure of Magnetocentrifugal Disk-Winds: From the Launching Surface to Large Distances (2001)
Krasnopolsky, Ruben, Li, Zhi-Yun, Blandford, Roger D.
Protostellar jets and winds are probably driven magnetocentrifugally from the surface of accretion disks close to the central stellar objects. The exact launching conditions on the disk, such as the...
Intrinsic and Extrinsic Galaxy Alignment (2000)
Catelan, Paolo, Kamionkowski, Marc, Blandford, Roger D.
We show with analytic models that the assumption of uncorrelated intrinsic ellipticities of target sources that is usually made in searches for weak gravitational lensing due to large-scale mass...
On the Formation of Jets (2000)
Celotti, Annalisa, Blandford, Roger D.
The phenomenology of jets associated with a variety of black hole systems is summarized, emphasizing the constraints imposed on their origin. Models of jet formation are reviewed, focusing in...
Compton Echoes from Gamma-ray Bursts (1999)
Madau, Piero, Blandford, Roger D., Rees, Martin J.
Recent observations of gamma-ray bursts (GRBs) have provided growing evidence for collimated outflows and emission, and strengthened the connection between GRBs and supernovae. If massive stars are...
Will GRB 990123 Perform an Encore? (1999)
Blandford, Roger. D., Helfand, David J.
The recent gamma ray burst, GRB 990123, has an absorption redshift z_s=1.60, implying an apparent energy $E \ge 3 \times 10^{54} erg$, and a peak luminosity $L_{max} \ge 6 \times10^{53}erg/s$,...
A brief summary of the properties of astrophysical black holes is presented. Various modes of accretion are distinguished, corresponding to accretion at rates from well below to well above the...
On the Nature of Pulsar Radio Emission (1998)
Lyutikov, Maxim, Blandford, Roger D., Machabeli, George
A theory of pulsar radio emission generation, in which the observed waves are produced directly by maser-type plasma instabilities operating at the anomalous cyclotron-Cherenkov resonance $\omega-...
Arav, Nahum, Barlow, Thomas A., Laor, Ari, Sargent, Wallace L. W., Blandford, Roger D.
We search for a direct signature of discrete ''clouds'' in the broad line region (BLR) of the Seyfert galaxy NGC 4151. For this purpose we apply cross correlation (CC) analysis to a high resolution...
A Statistical Analysis of the Galaxy Populations of Distant Luminous X-ray Clusters (1997)
Smail, Ian, Edge, Alastair C., Ellis, Richard S., Blandford, Roger D.
We present a deep UBI CCD survey using the Palomar 5-m telescope of a sample of high X-ray luminosity, distant clusters selected from the ROSAT All-Sky Survey. The 10 clusters lie at z=0.22-0.28, an...
The External Shear Acting on Gravitational Lens B 1422+231 (1997)
Kundic, Tomislav, Hogg, David W., Blandford, Roger D., Cohen, Judith G., Lubin, Lori M., Larkin, James E.
In a number of multiply imaged quasar systems, a significant contribution to the lensing potential is provided by groups and clusters of galaxies associated with the primary lens. As part of an...
Kundic, Tomislav, Cohen, Judith G., Blandford, Roger D., Lubin, Lori M.
The quadruple system PG 1115+080 is the second gravitational lens with a reported measurement of the Hubble constant. In addition to the primary lens, three nearby galaxies are believed to contribute...
Gravitational Lensing and the Extragalactic Distance Scale (1996)
Blandford, Roger D., Kundic, Tomislav
The potential of gravitational lenses for providing direct, physical measurements of the Hubble constant, free from systematic errors associated with the traditional distance ladder, has long been...
Papers presented at the Workshop on the Galactic Center, held at the California Institute of Technology, Jan. 7-8, 1982